scholarly journals Limits of FPGA acceleration of 3D Green's Function computation for geophysical applications

Author(s):  
Nachiket Kapre ◽  
Jayakrishnan Selva Kumar ◽  
Parjanya Gupta ◽  
Sagar Masuti ◽  
Sylvain Barbot
Author(s):  
Samaneh Fooladi ◽  
Tribikram Kundu

Elastodynamic Green's function for anisotropic solids is required for wave propagation modeling in composites. Such modeling is needed for the interpretation of experimental results generated by ultrasonic excitation or mechanical vibration-based nondestructive evaluation tests of composite structures. For isotropic materials, the elastodynamic Green’s function can be obtained analytically. However, for anisotropic solids, numerical integration is required for the elastodynamic Green's function computation. It can be expressed as a summation of two integrals—a singular integral and a nonsingular (or regular) integral. The regular integral over the surface of a unit hemisphere needs to be evaluated numerically and is responsible for the majority of the computational time for the elastodynamic Green's function calculation. In this paper, it is shown that for transversely isotropic solids, which form a major portion of anisotropic materials, the integration domain of the regular part of the elastodynamic time-harmonic Green's function can be reduced from a hemisphere to a quarter-sphere. The analysis is performed in the frequency domain by considering time-harmonic Green's function. This improvement is then applied to a numerical example where it is shown that it nearly halves the computational time. This reduction in computational effort is important for a boundary element method and a distributed point source method whose computational efficiencies heavily depend on Green's function computational time.


1986 ◽  
Vol 6 (3) ◽  
pp. 243-254 ◽  
Author(s):  
A. Nakatani ◽  
N. G. Alexopoulos ◽  
N. K. Uzunoglu ◽  
P. L. E. Uslenghi

2017 ◽  
Author(s):  
Agah D. Garnadi ◽  
Sri Nurdiati ◽  
Windiani Erliana

Current formulas in credibility theory often calculate net premium as a weighted sum of the average experience of the policyholder and the average experience of the entire collection of policyholders. Because these formulas are linear, they are easy to use. Another advantage of linear formulas is that the estimate changes a fixed amount per change in claim experience, if an insurer uses which a formal, then the policyholder can predict the change in premium. In a series of writing, Young(1997,1998,2000) apply decision theory to develop a credibility formula that minimizes a loss function that is linear combination of a squared-error term and a second-derivative term or first order term. This loss function as a variational forms, is equivalent to fourth order or second order linear differential equation, respectively. This allows us for evaluation to Green's function computation via symbolic calculation to compute details of Green's function to obtain the solution.


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